Small angle neutron scattering theory

The size and shape of polymer chains joined in a crosslinked matrix can be measured in a small angle neutron scattering (SANS) experiment. This is a-chieved by labelling a small fraction of the prepolymer with deuterium to contrast strongly with the ordinary hydrogenous substance. The deformation of the polymer chains upon swelling or stretching of the network can also be determined and the results compared with predictions from the theory of rubber elasticity. 

For both polymer systems the static structure factors were investigated using small angle neutron scattering and the results interpreted in terms of RPA theory. Figure 6.6 displays the temperature-dependent static structure factor obtained from a PE-PEE melt (sample IV). 

Whitmore and Noolandi (1985b) developed the self-consistent field theory to examine micellization in AB diblocks in a blend of AB diblock and A homopolymer solvent . The model was applied specifically to the case of PS-PB diblocks in PB homopolymer for comparison with the results of small-angle neutron scattering (SANS) experiment by Selb et al. (1983). This model is discussed in more detail in Section 3.4.2. 

F. Boue, J. Bastide, M. Buzier, A. Lapp, J. Herz and T.A. Vilgis, Strain induced large fluctuations during stress relaxation in polymer melts observed by small-angle neutron scattering. Lozenges , butterflies , and related theory, Coll. Polym. Sci., 269, 195 (1991). 

Semd equation [1.6.5.23], fig. 1.6.15b SANS = small angle neutron scattering Saxen s rule (electrokinetics) 1.6.17, 4.2 SAXS = small angle X-ray scattering seeding theory 5.11, B.4c... 

---